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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Groupings (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Assets [Abstract] |  |
Securities held-to-maturity | $ 358,689 | $ 177,354
Carrying Amount |  |
Financial Assets [Abstract] |  |
Cash and due from banks | 432,994 | 393,722
Securities held-to-maturity | 383,922 | 179,309
Loans held for investment, net | 9,169,055 | 9,158,908
Accrued interest receivable | 38,456 | 40,149
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,648,328 | 9,605,731
Certificates of Deposits ("CDs") | 781,775 | 853,242
FHLBNY Advances | 50,000 | 25,000
Subordinated debt, net | 197,050 | 197,096
Other short-term borrowings | 2,853 | 1,862
Accrued interest payable | 1,611 | 870
Fair Value |  |
Financial Assets [Abstract] |  |
Cash and due from banks | 432,994 | 393,722
Securities held-to-maturity | 358,689 | 177,354
Loans held for investment, net | 9,095,834 | 9,169,872
Accrued interest receivable | 38,456 | 40,149
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,648,328 | 9,605,731
Certificates of Deposits ("CDs") | 782,385 | 857,342
FHLBNY Advances | 50,039 | 25,014
Subordinated debt, net | 198,650 | 202,334
Other short-term borrowings | 2,853 | 1,862
Accrued interest payable | 1,611 | 870
Level 1 Inputs [Member] | Fair Value |  |
Financial Assets [Abstract] |  |
Cash and due from banks | 432,994 | 393,722
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,648,328 | 9,605,731
Other short-term borrowings | 2,853 | 1,862
Level 2 Inputs [Member] | Fair Value |  |
Financial Assets [Abstract] |  |
Securities held-to-maturity | 358,689 | 177,354
Accrued interest receivable | 4,483 | 4,481
Financial Liabilities [Abstract] |  |
Certificates of Deposits ("CDs") | 782,385 | 857,342
FHLBNY Advances | 50,039 | 25,014
Subordinated debt, net | 198,650 | 202,334
Accrued interest payable | 1,611 | 870
Level 3 Inputs [Member] | Fair Value |  |
Financial Assets [Abstract] |  |
Loans held for investment, net | 9,095,834 | 9,169,872
Accrued interest receivable | $ 33,973 | $ 35,668

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